PMID: 2120457Sep 1, 1990Paper

A human metallothionein pseudogene containing AG/CT repetitive elements

Journal of Molecular Evolution
J M Walker, L Gedamu

Abstract

A lambda phage recombinant clone, 25 S, which contains a 15.5-kb EcoRI human genomic DNA fragment, has been characterized. Restriction mapping and Southern blot hybridization indicated a 3.0-kb HindIII fragment containing metallothionein (MT)-like sequences. Several interesting features were found upon comparison of this nucleotide sequence with that of other human MT genes: (1) sequences representing the 5' regulatory region, the 5' untranslated region, and the first exon are not contained in the 3.0-kb HindIII fragment; (2) the coding sequence of the second exon (amino acids 10-31 encoding a portion of the beta-domain of the MT protein) has 11 amino acid changes out of a total of 21, whereas, the third exon (amino acids 32-61, representing the complete alpha-domain of the MT protein) has only 4 amino acid substitutions; however, all cysteine residues are conserved; (3) this MT-like gene retains intron sequences and processing signals; (4) Southern blot analysis of human genomic DNA indicated this MT-like gene is located on a 10.5-kb EcoRI genomic DNA fragment; and (5) unusual AG/CT-rich repetitive elements are located within the second intron and upstream of the second exon of this MT-like gene. This gene is not expressed in ...Continue Reading

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